Blackberry has cut a deal with security officials in India, allowing them access e-mail and data sent using BlackBerry’s network. But the Indian government isn’t done yet. It’s now applying pressure to some other high-tech players.

Indian officials say they’re exploring ways to track the contents of conversations on Google’s video chat service and on Skype.

We speak with Fred Cate, a law professor at Indiana University who specializes in privacy and security, to understand what - if anything - security services gain when they try to mine massive amounts of information in search of terrorists.